JP5107324B2 - Method for producing coffee extract and coffee beverage - Google Patents

Description

  The present invention relates to a coffee extract containing a large amount of chlorogenic acid, a method for producing the same, and a coffee beverage containing the coffee extract.

  Chlorogenic acids contained in foods such as coffee have an antioxidant action and an antihypertensive action. A large amount of chlorogenic acids are contained in green coffee beans, but when roasted, many of them are decomposed, and therefore, coffee beverages generally do not contain high concentrations of chlorogenic acids.

  In order to produce a coffee beverage containing a high concentration of chlorogenic acids, conventionally, freshly roasted coffee beans or roasted roasted beans that do not reduce chlorogenic acid have been extracted with water or a water-containing water-miscible organic solvent. However, although an extract of fresh coffee beans or lightly roasted beans contains a high concentration of chlorogenic acid, it is not suitable for drinking because it has a strong grain odor and a weak flavor. Therefore, for example, in Patent Document 1, an extract obtained from roasted coffee beans or green coffee beans having an L value of 25 or more is added to an extract obtained from roasted coffee beans having an L value of 16 to 20, and chlorogen is added. It is described that the acid content is adjusted. However, even if raw coffee beans or lightly roasted beans extract is mixed with deep roasted bean extract, grain odor derived from green beans or lightly roasted beans has an effect and is not a flavor that is acceptable as a coffee beverage. There was a problem.

Japanese Patent No. 397670

  An object of the present invention is to provide a coffee extract that can produce a coffee beverage having a good flavor without containing grain odor while containing chlorogenic acids at a high concentration. Moreover, it aims at providing the manufacturing method of this coffee extract, and the coffee drink containing this coffee extract.

  In one aspect of the present invention, there is provided a method for producing a coffee extract, comprising the steps of obtaining an extract from lightly roasted coffee beans and concentrating the extract at a temperature in the range of 50 to 90 ° C. .

In another aspect of the present invention, there is provided a method for producing a coffee beverage, characterized in that the coffee extract obtained by the above production method is mixed with a deep roasted coffee bean extract.

In a further aspect of the present invention, an extract is obtained from shallow roasted coffee beans, the first step of obtaining a coffee extract by concentrating the extract at a temperature in the range of 50-90 ° C, and extracted from deep roasted coffee beans A second step of obtaining a liquid, and a third step of mixing the coffee extract obtained in the first step and the deeply roasted coffee bean extract obtained in the second step. A method for producing a coffee beverage is provided.

  ADVANTAGE OF THE INVENTION According to this invention, the coffee extract which can manufacture the coffee beverage which contains a chlorogenic acid in high concentration by adding to the extract of deep roasted coffee beans and has favorable flavor, and the coffee containing this coffee extract It is possible to provide a beverage.

Chromatogram by flavor holder RC-30.

  The coffee extract of the present invention is characterized by containing chlorogenic acids at a concentration of 0.6% by weight or more and having a weak grain odor. The coffee extract of the present invention is capable of adjusting the content of chlorogenic acids in a coffee beverage and improving the flavor by adding it to a deep roasted coffee bean extract in the production of a coffee beverage.

  More preferably, the coffee extract of the present invention contains chlorogenic acids in an amount of 0.6 to 18% by weight, more preferably 0.9 to 12% by weight, and particularly preferably 1.5 to 9% by weight. Contains by concentration.

  Furthermore, the coffee extract of the present invention has Brix of 4 to 60, preferably 6 to 40, particularly preferably 10 to 30.

  The coffee extract of the present invention is a concentrated extract obtained by concentrating while heating an extract of coffee beans having Brix of 2 to 6. Such a concentrated extract can be produced by a production method including a step of obtaining an extract from shallow roasted coffee beans and a step of concentrating the extract at a temperature in the range of 50 to 90 ° C.

  The lightly roasted coffee beans are obtained by shallow roasting of green coffee beans, and it is preferable to roast the L value in the range of 30 to 50 from the viewpoint of the chlorogenic acid content. Roasting may be performed by a normal method, and conditions such as roasting environment and roasting temperature are not particularly limited and can be determined as appropriate.

  In the method for producing a coffee extract of the present invention, first, a light roasted coffee bean is extracted to obtain an extract. Extraction may be carried out by a usual method, for example, a method such as a boiling method, an espresso method, a siphon method, a drip method (paper, nell), or a column method (continuous extraction) can be used, but is not limited thereto. . The extraction conditions are not particularly limited, and for example, lightly roasted coffee beans or a pulverized product thereof can be extracted using water to hot water (0 to 100 ° C.) for 10 seconds to 30 minutes.

  The resulting extract is then concentrated at a temperature in the range of 50-90 ° C. The present inventors have found that the grain odor derived from shallow roasted coffee beans can be reduced by concentrating the extract of shallow roasted coffee beans at a temperature of 50 ° C. or higher. In general, it is considered that the content of components increases when concentrated, and the content of chlorogenic acids actually increases. Therefore, it is expected that the grain odor will also become strong. Surprisingly, it has been found that the grain odor is reduced by concentration, and further, the bitterness and richness remaining in the aftertaste are produced, and the flavor balance is improved. It was.

  Therefore, by concentrating the extract of lightly roasted coffee beans at a temperature of 50 ° C. or higher, coffee containing a high concentration of chlorogenic acids, reduced grain odor, and having a bitter and rich feeling remaining in the aftertaste. It is possible to produce an extract.

  When the concentration temperature is less than 50 ° C., the concentration time becomes longer and grain odor remains, resulting in a poor flavor balance. Further, when the concentration temperature exceeds 90 ° C., the grain odor is reduced, but the acidity becomes strong. In particular, when it is boiled and concentrated at 100 ° C., the acidity becomes too strong and the original flavor of coffee is impaired. More preferably, the extract is concentrated at a temperature in the range of 60-70 ° C. The coffee extract concentrated in this temperature range emphasizes the bitter feeling remaining in the aftertaste and has a good flavor balance.

  Concentration of the lightly roasted coffee bean extract is preferably performed by vacuum concentration. Concentration under reduced pressure can reduce grain odor in a short time without affecting quality.

  The coffee extract obtained by the above method contains chlorogenic acids at a concentration of 0.6% by weight or more, has a weak grain odor derived from lightly roasted coffee beans, and has a bitter feeling remaining in the aftertaste. The balance of flavor is good.

  The coffee extract of the present invention refers to a product obtained by extracting 18 g to 272 g, preferably 27 g to 181 g, particularly preferably 45 g to 136 g of coffee beans in terms of green beans per 100 g.

  The chlorogenic acids in the present invention include monocaffeoylquinic acids such as 3-caffeoylquinic acid (3CQA), 4-caffeoylquinic acid (4CQA) and 5-caffeoylquinic acid (5CQA), and 3-ferlaquinic acid. Monoferlaquinic acids such as (3FQA), 4-ferlaquinic acid (4FQA) and 5-ferlaquinic acid (5FQA), and 3,4-dicaffeoylquinic acid (3,4diCQA), 3,5-dicaffee Dicaffeoylquinic acids such as oil quinic acid (3,5diCQA) and 4,5-dicaffeoylquinic acid (4,5diCQA) are included.

  The type of coffee beans used as a raw material for the coffee extract and coffee beverage of the present invention may be either Arabica or Robusta. More specifically, the coffee beans may be selected from, but not limited to, Brazil, Colombia, Vietnam, Tanzania and Mocha. One kind of coffee beans may be used alone, or a plurality of kinds may be blended and used. When Arabica is used as a raw material for the coffee extract, the acidity tends to stand out, and Robusta coffee beans are more preferably used.

  The coffee extract of the present invention preferably has an appropriate pH. When the pH is low, the acidity tends to be felt strongly. On the other hand, when the pH is high, the flavor tends to be weak and the salty taste tends to be strong, and 5CQA tends to isomerize and decrease. The pH may be adjusted by adding ascorbic acid or sodium bicarbonate to the coffee extract. Or you may carry out by adding ascorbic acid, baking soda, etc. to an extract at the time of extraction of light roasted coffee beans. Or you may adjust with both an extract and a coffee extract.

  The pH of the coffee extract is preferably in the range of 5 to 6.5. More preferably, the pH of the coffee extract is in the range of 5.1 to 6, particularly preferably in the range of 5.3 to 5.8. For example, when the pH of the coffee extract is about 5.3, the grain odor is reduced, it has a slight acidity, the bitter feeling is emphasized, and the flavor is good. Further, when the pH of the coffee extract was adjusted to about 5.7 with sodium bicarbonate, the flavor was milder than when the pH was not adjusted.

  The pH of the lightly roasted coffee bean extract is preferably in the range of 4.8 to 6.6. More preferably, the pH of the extract is in the range of 5.0 to 6.4, particularly preferably in the range of 5.3 to 6.2. For example, when the pH of the extract was about 5.3, the grain odor was reduced, it had a slight acidity, the bitter feeling was emphasized, and the flavor was good. Moreover, when the pH of the extract was adjusted to about 6.2 with sodium bicarbonate, the flavor was milder than when the pH was not adjusted.

  In another aspect of the present invention, a coffee beverage comprising the above coffee extract is provided. Such a coffee beverage includes the above-described coffee extract and deep roasted coffee bean extract. By mixing the coffee extract as described above with the deep roasted coffee bean extract, it is possible to provide a coffee beverage having a good flavor while containing a high concentration of chlorogenic acids. Specifically, it is possible to provide a coffee beverage in which the smell of grains derived from lightly roasted coffee beans is reduced, and the bitter feeling and richness remaining in the aftertaste are emphasized while maintaining the original flavor of coffee. .

The coffee beverage of the present invention contains a coffee extract and a deep roasted coffee bean extract in a blending ratio in the range of 1: 1.5 to 1:19 in terms of solid content, more preferably 1: 2.3. It is included at a blending ratio of ˜1: 9. Here, the solid content converted value is represented by the following formula:
Solid content conversion value = Brix / 100 x blending amount of coffee extract or deep roasted coffee bean extract

<Test 1>
The relationship between the roasted degree of coffee beans and the content (% by weight) of chlorogenic acids contained in the hot water extract produced using those coffee beans was examined. The coffee beans were roasted to the L value shown in Table 2 and pulverized by a pulverizer, and then 20 times the amount (weight basis) of 90 ° C. warm water was added and extracted while stirring for 10 minutes. The extracted mixture was filtered using a 150 mesh sieve to remove coffee bean residues and cooled to 30 ° C. or lower. The liquid obtained by filtration was concentrated and then freeze-dried to obtain a hot water extract.

The content of chlorogenic acids contained in the hot water extract was measured by the HPLC method. The measurement conditions of the HPLC method are as follows. As the analytical column, Imtakt Cadenza CD-C18 100 × 4.6 mm was used. As the mobile phase, liquid A, 0.05 M acetic acid, liquid B, 0.05 M acetic acid-containing 100% acetonitrile were used, and the mixture was sent according to the gradient program shown in Table 1. The column temperature was set to 40 ° C., the sample cooler was set to 4 ° C., and the detection wavelength was measured at UV 325 nm.

How to create a calibration curve:
A standard product of 5-caffeoylquinic acid (5CQA) (manufactured by Wako Pure Chemical Industries, Ltd.) was prepared with distilled water to a concentration of 5 levels within a range of about 5 ppm to 200 ppm, and used as a standard solution. The standard solution of each concentration was filtered through a 0.45 μm filter and then injected into HPLC, and a 5-check quantity curve was created from the obtained peak area value and concentration.

Sample preparation and quantification methods:
100 mg of each sample was accurately weighed, placed in a 100 mL volumetric flask, dissolved in distilled water, then fixed, filtered through a 0.45 μm filter, and injected into HPLC. Quantification was performed only for 5CQA by the above-mentioned 5-inspection curve method and calculated as the content (% by weight). 3-caffeoylquinic acid (3CQA), 4-caffeoylquinic acid (4CQA), 3-ferlaquinic acid (3FQA), 4-ferlaquinic acid (4FQA), 5-ferlaquinic acid (5FQA), 3,4-dicaffee Oil quinic acid (3,4diCQA), 3,5-dicaffeoylquinic acid (3,5diCQA), 4,5-dicaffeoylquinic acid (4,5diCQA) is flavor holder RC-30 (Hasegawa Koryo Co., Ltd.) ), And the area value of each peak was quantified as 5CQA equivalent using a 5CQA calibration curve and calculated as content (% by weight). In FIG. 1, the chromatogram by the flavor holder RC-30 about the raw bean extract was shown.

Table 2 shows the analysis results. In the following tables, Total CQA means the total amount of 3CQA, 4CQA and 5CQA, Total FQA means the total amount of 3FQA, 4FQA and 5FQA, and Total diCQA means 3,4diCQA, 3,5diCQA and 4 , 5diCQA means the total amount, and Total means the total amount of the above chlorogenic acids.

  Table 2 shows that the total amount of 5CQA, CQA, total amount of FQA, total amount of diCQA, and total amount of chlorogenic acids decreased with decreasing L value, that is, with deeper roasting. .

<Test 2>
The relationship between concentration temperature and flavor in the coffee extract production process was investigated by sensory evaluation. 800 g of roasted coffee beans (Vietnam G-1P) roasted to an L value of 33 was stirred and extracted in 7200 g of hot water at 90 ° C. for 15 minutes. This was filtered using a colander and a 150 mesh sieve to separate the coffee residue (solid content) to obtain an extract. The extract was cooled to below 30 ° C. and then filtered. The amount of the extract after the channel filtration was 5392 g. The pH of the extract was 5.24, Brix was 3.53, and the extraction efficiency was 23.8%. This extract was divided into 8 equal parts to obtain samples 1 to 7 and a control extract.

  While the extract for Samples 1 to 6 is heated by an evaporator at temperatures of 30 ° C., 40 ° C., 50 ° C., 60 ° C., 70 ° C. and 80 ° C. (Approximate raw bean equivalent amount)) The solution was concentrated under reduced pressure until the following condition was reached, and the extract solution for sample 7 was boiled and concentrated at 100 ° C.

Then, fine adjustment with distilled water was performed so that the liquid amount of each concentrated liquid became 130 g, and coffee extracts of Samples 1 to 7 were obtained. As a control, the extract after the channel filtration was used as it was without concentrating. The analysis results of the total amount of Brix, pH, 5CQA, and chlorogenic acids for each coffee extract are shown in Table 3.

Samples 1 to 7 and the control were diluted with distilled water to adjust Brix to 1, and sensory evaluation was performed. The sensory evaluation was performed by six professional panelists, and the items relating to grain odor, bitter feeling, flavor balance, sourness, and overall evaluation (deliciousness) were scored on a scale of ± 10 with 0 as the control. The results are shown in Table 4.

  As shown in Table 4, the grain odor was significantly reduced in Samples 3 to 7 as compared with the control, and the bitter feeling remaining in the aftertaste was enhanced. Moreover, in the samples 3-6 whose concentration temperature is 50 degreeC-80 degreeC, the balance of flavor became favorable and the comprehensive taste was also increasing. On the other hand, in samples 1 and 2 where the concentration temperatures were 30 ° C. and 40 ° C., the grain odor was slightly reduced, and in sample 7 boiled and concentrated, the acidity was remarkably strong, and the balance of flavor was poor. From the above, it was shown that the concentration temperature of the coffee extract is preferably in the range of 50 to 90 ° C, more preferably 60 to 70 ° C.

<Test 3>
A coffee beverage containing Samples 1 to 7 prepared in Test 2 and a control coffee extract was prepared, and the relationship between the concentration temperature in the coffee extract production process and the flavor of the coffee beverage was examined by sensory evaluation.

A deep roasted coffee bean extract was prepared as follows. First, 284 g of roasted coffee beans (Brazil 4/5) having an L value of 20.4 was drip extracted with hot water of about 10 times the amount of 90 ° C., and the extract was subjected to flannel filtration and cooled to 30 ° C. or lower. The amount of the extracted solution after the channel filtration was 2629 g, the pH was 5.36, Brix 3.01, and the extraction efficiency was 27.9%. This deep roasted bean extract was divided into 8 equal parts, and the coffee extracts of Samples 1 to 7 prepared in Test 2 were blended at 1% of the total weight. In addition, 5% of the control was blended to adjust the solid content. Next, distilled water was added to adjust the liquid volume to about 700 g, the pH was adjusted to 6.4 using sodium bicarbonate, and the liquid volume was finally adjusted to 1 kg with distilled water. Thereafter, the can was filled and sterilized by retort at 123 ° C. for 7 minutes. The sensory evaluation of the coffee beverage was performed in the same manner as in Test 2. The results are shown in Table 5.

  As shown in Table 5, coffee beverages (samples 3-7) containing coffee extract concentrated at 50 ° C. or higher compared to coffee beverages (control) formulated without concentrating the extract of lightly roasted coffee beans The grain odor was significantly reduced and the bitterness and flavor remaining in the aftertaste were also enhanced. On the other hand, the coffee beverages (samples 1 and 2) containing the extract concentrated at 30 ° C. and 40 ° C. had relatively little reduction in grain odor and the bitter feeling was not strong. Moreover, in the coffee drink (sample 7) which mix | blended the coffee extract boiled and concentrated at 100 degreeC, miscellaneous taste became strong other than acidity, and the total deliciousness also became low.

  From the above results, the coffee beverage containing the coffee extract concentrated at a temperature of 50 to 90 ° C., preferably 60 to 70 ° C. has no grain odor, emphasizes the bitter feeling of the aftertaste, and has a good flavor. Indicated.

<Test 4>
A coffee drink containing the coffee extract prepared in Test 2 was prepared, and flavor deterioration due to warm storage was investigated.

  A deep roasted coffee bean extract was prepared as follows. First, 166.4g of roasted coffee beans (Brazil 4/5) with L value of 20.4 was drip extracted with hot water of about 10 times the amount of 90 ° C (weight basis), and the extract was subjected to nell filtration, then 30 ° C Cooled to: The amount of the extract after the channel filtration was 1563 g, the pH was 5.15, Brix 2.88, and the extraction efficiency was 27.4%. This deep roasted coffee bean extract was divided into three equal parts, and 34.4 g of the coffee extract of Sample 5 prepared in Test 2 (1.72% of the total weight of 2 kg) was blended. Similarly, as a comparative control 1, 173 g of a control lightly roasted coffee bean extract prepared in Test 2 (no concentration) (8.65% of the total weight of 2 kg) was blended. Furthermore, as Comparative Control 2, a deep roasted coffee bean extract was blended alone. Next, after adding distilled water to each to adjust the liquid volume to about 1.4 kg, the pH was adjusted to 6.4 using sodium bicarbonate, and finally the liquid volume was adjusted to 2 kg with distilled water. Thereafter, the can was filled and sterilized by retort at 123 ° C. for 7 minutes.

Each coffee drink was stored at 60 ° C. for 2 weeks, and then sensory evaluation was performed by six professional panelists. The results are shown in Table 6.

  As shown in Table 6, a coffee beverage prepared by adding a deep roasted coffee bean extract alone without adding a coffee extract has a very strong acidity and a weak flavor after being stored at 60 ° C. for 2 weeks. As a result, significant deterioration was observed. In addition, the coffee beverage containing the non-concentrated lightly roasted coffee bean extract had a strong grain odor and a strong acidity. On the other hand, the coffee beverage containing the coffee extract concentrated at 70 ° C. had a weak grain odor, suppressed acidity, and felt a bitter feeling in the aftertaste.

  From the above, it was shown that the coffee beverage containing the coffee extract of the present invention has a grain odor and a sour taste even after warm storage, has a bitter feeling in the aftertaste, and maintains a good flavor.

<Test 5>
Sensory evaluation on the blending ratio of coffee extract and deep roasted coffee bean extract was performed. As the coffee extract, a coffee extract (Brix 21.8, concentrated at 70 ° C.) produced by the same process as Sample 5 of Test 2 was used except that the extraction method was column extraction.

  An extract of deep roasted coffee beans was prepared as follows. First, 500 g of coffee beans roasted to L value 17 (Brazil 4/5) were drip-extracted with hot water of about 8 times the amount (weight basis) of 90 ° C., and the extract was filtered to 30 ° C. or lower . The amount of the extracted solution after the channel filtration was 4079 g, pH 5.17, Brix 3.47, and the extraction efficiency was 28.3%. A coffee extract and a deep roasted bean extract produced by the same method as Sample 5 of Test 2 were blended as shown in Table 7. Next, after adding distilled water to adjust the liquid volume to about 1.4 kg, the pH was adjusted to 6.4 using sodium bicarbonate, and the liquid volume was finally adjusted to 2 kg with distilled water. Thereafter, the can was filled and sterilized by retort at 123 ° C. for 7 minutes.

  Further, as a comparative control, a deep-roasted coffee bean extract was used alone to prepare a coffee beverage in the same manner as described above.

The sensory evaluation of each coffee beverage was performed by six professional panelists in the same manner as in Test 2, and the items relating to the balance of flavor, miscellaneous taste, and overall evaluation (deliciousness) were scored at ± 10 points with a control of 0 points. The results are shown in Table 8.

  As shown in Table 8, the coffee extract and the deep roasted coffee bean extract were compared with a 1:19 to 1 in terms of solid content, compared to the coffee beverage (control) prepared using the deep roasted coffee bean extract alone. Samples 1 to 5 blended at a blending ratio of 1.5 have a good balance of flavor and high overall taste evaluation.

  On the other hand, Samples 6 and 7 in which the blending ratio of the coffee extract and the deep roasted coffee bean extract is 1: 1 and 1: 0.67 have significantly high miscellaneous taste, poor flavor balance, and comprehensive taste. The evaluation was also low.

  From the above results, the coffee extract and the deep roasted coffee bean extract are blended in the range of 1: 1.5 to 1:19 in terms of solid content, preferably in the blending ratio of 1: 2.3 to 1: 9. As a result, it was shown that the balance of the flavor of the coffee beverage was improved and the evaluation of the overall taste was high.

  According to the present invention, it is possible to produce a coffee beverage that contains chlorogenic acids at a high concentration and has a good flavor. It is also possible to produce a coffee extract that is used to produce such a coffee beverage.

Claims (9)

Obtaining an extract from lightly roasted coffee beans roasted in the range of L value 30-50;
Concentrating the extract at a temperature in the range of 50-90 ° C .;
A method for producing a coffee extract for producing a coffee beverage .   The manufacturing method according to claim 1, wherein 18 g or more of green beans are extracted per 100 g of the coffee extract.   The manufacturing method according to claim 1, wherein the concentration step is concentration under reduced pressure.   The coffee extract obtained by the manufacturing method in any one of Claims 1-3 is mixed with the extract of deep roasted coffee beans, The manufacturing method of the coffee drink characterized by the above-mentioned.   The method for producing a coffee beverage according to claim 4, wherein the coffee extract and the deep-roasted coffee bean extract are mixed at a blending ratio of 1: 1.5 to 1:19 in terms of solid content. .   The method for producing a coffee beverage according to claim 4, wherein the coffee extract and the deep roasted coffee bean extract are mixed at a mixing ratio of 1: 2.3 to 1: 9 in terms of solid content. . A first step of obtaining a coffee extract by obtaining an extract from shallow roasted coffee beans roasted in the range of L value 30-50, and concentrating the extract at a temperature in the range of 50-90 ° C;
A second step of obtaining an extract from deep roasted coffee beans;
A third step of mixing the coffee extract obtained in the first step and the deep roasted coffee bean extract obtained in the second step;
A method for producing a coffee drink, comprising:   The method for producing a coffee beverage according to claim 7, wherein the coffee extract and the deep roasted coffee bean extract are mixed at a blending ratio of 1: 1.5 to 1:19 in terms of solid content. .   8. The method for producing a coffee beverage according to claim 7, wherein the coffee extract and the deep-roasted coffee bean extract are mixed at a blending ratio of 1: 2.3 to 1: 9 in terms of solid content. .

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